Start with the account that you know does have a license which includes desktop software. The best bet is to uncheck them all and see if Microsoft Outlook starts up without the error. Some schools also only assign BASIC licenses (webmail and mobile apps only), so that account may not be enabled for use with Outlook desktop client. Use the OLD 'Mail' INTERFACE via control panel so you can MANUALLY configure an account that you add. Compatibility mode is NOT needed with any version of Outlook on any versions of Windows. When you add an address nowadays, it automatically chooses what it thinks is the best way to configure it, always wanting to optimize/prioritize an Exchange or 365 connection - it takes you right to that auth screen without allowing you to choose the protocol. This problem may occur if you are running Outlook in Compatibility mode. Any email addresses belonging to a second tenant are best added via IMAP. It becomes the PRIMARY account for the install. Check if Outlook is Running in Compatibility Mode 10. You didn't mention in your post what/how many or what type of email addresses - someone else probably would also have picked up on that sooner. I think you can only have ONE organization in your Outlook. Take a screenshot of the property sheet and save the image to a location of your choice.Īfter you've captured the titles of the selected add-ins, clear all selected check boxes, and then choose OK.But adding other m365 emails such as other company emails and my school email also failed Manually record the title of every selected add-in listed under Available Add-ins. In the upper-left corner of Outlook, choose File > Options > Add-ins.Īt the bottom of the View and manage Office Add-ins, make sure the Manage box shows COM Add-ins, and then choose Go.Īs a precaution, when the COM Add-ins listing of your current add-ins opens, do one of the following: If the problems persists, then uncheck the 'Compatibility Mode' option in 'Outlook.exe' file. At Compatibility tab, uncheck the ' Run this program in compatibility mode ' checkbox. Right click on Outlook.exe and click on Properties and then click on Compatibility tab. Right click at Microsoft Outlook shortcut and select Properties. Select Run Tests: Outlook User Connectivity to download and run the diagnostic. The diagnostics perform automated checks to detect issues and provide possible solutions to fix them. If you are using a 64 bit machine, go to C:/Program Files x86/Microsoft Office/Office 15/Outlook.exe. Run a Microsoft 365 Diagnostic: There are Microsoft diagnostics that you can run to troubleshoot connectivity issues. If Outlook is NOT able to start in safe mode, then try the next proposed solution below, entitled Create a new Outlook profile. 6 Fast Tips to Fix Cannot Start Microsoft Outlook Error 1 Turn off Compatibility Mode 2 Start Outlook in Safe Mode 3 Recover Navigation Pane. Open My Computer/Local Disk C/Program Files/Microsoft Office/Office 15/Outlook.exe. Replies (40) 1) Open Control Panel > Programs and Features 2) Click Microsoft Office in the list of installed applications 3) At the top, click 'Change' > On the resulting dialog, click 'Repair' 4) Choose the online repair to make sure everything gets fixed (the faster Quick Repair option is also. Click on the Outlook Icon, the program should now open without any. You'll need to disable all of your add-ins before restarting Outlook, as described in the following procedures: The run box will appear, type in the following command: outlook.exe /resetnavpane. If Outlook is able to start in safe mode, then the problem is likely with one of your add-ins. The Outlook icon on your taskbar includes an exclamation symbol to alert you the program isn't operating normally. How do you know you're working in safe mode? You'll see a label similar to the one below at the top of the screen.
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